CTratio Series
Fiber Optic (Ratio) Pyrometers
Ratio pyrometry has been the preferred technology in the metal processing industries due in no small part to its ability to deliver accurate temperature measurements on lower emissivity surfaces in conditions that would compromise accuracy with single wavelength pyrometers. Steam, dust and vapors are realities in most metal processing environments. Infrared windows that also attenuate the IR signal emitted from metal targets are also common when measuring temperatures of metal parts inside chambers. In our testing, we have been able to simulate these conditions and validate temperature measurement accuracy even when the infrared signal is attenuated up to 90% by using the two color ratio radiometric technology deployed in the CTratio Series. The same results are achieved when the object to be measured would not be properly resolved (too small or far away from sensor) by a single wavelength sensor.
In addition to measurement accuracy, the CTratio Series is also the best solution when the sensor or the fiber optic cable connecting to the electronics module needs to be deployed in hot ambient conditions without the use of water cooling accessories. The standard CTratio sensor head and fiber optic can withstand 200 °C (392 °F) without a water cooling accessory. A special high temperature fiber optic cable and sensing head option is available at an affordable price that equips the CTratio to deliver accurate temperature measurements in environments up to 315 °C (599 °F).
CTratio for small, obscured or moving objects
Which Is the Right Infrared Thermometer?
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Why IR Thermometers of CTratio Series?
- Rugged fiber-optic ratio non-contact temperature measurement
- Temperature measurements to 3000 °C
- Laser sighting for real spot size indication at any distance.
- Variable focus increases options for mounting locations.
- Electrically isolated sensing head and fiberoptic for ambient temperatures up to 315 °C without cooling (CTratio)
The robust fiber-optic ratio Optris CTratio pyrometer redefines non-contact thermometry and delivers the most consistent and repeatable non-contact temperature measurement results.
With rising temperatures of and object, its emitted radiation increases within the overall wavelength range, and additionally, the maximum of the spectral-specific radiation shifts to shorter wavelengths. Unlike intensity-based single-color pyrometers, which measure the power of the emitted infrared radiation that correlates to the object’s temperature and emissivity, ratio-based pyrometers measure the infrared radiation at two closely spaced wavelengths and evaluate the relationship between the two intensities.
Therefore, one of the standout features of the Optris CTratio is its ability to provide repeatable and accurate measurements even in adverse conditions. Unlike single-color devices, a ratio pyrometer can even measure reliably when the emissivity is unknown or changing with the temperature, as long as both wavelength signals are affected proportionally by emissivity or process changes.
Ratio pyrometers are often used if the measuring spot is not fully placed on the object or the object is smaller than the pyrometer spot size if changing transmissions are present in the optical path of the pyrometer – like dust, steam, obstacles – or if the object surface emissivity is changing within a certain amount. The two-color pyrometer is largely resistant to dust, smoke, steam, and dirty observation windows. If changing transmissions within the optical path are present, the pyrometer allows for a reliable measurement even with up to 90 percent attenuation.
Moreover, the two-color measurement principle allows reliable measuring temperatures even when the object is not fully placed within the field of view of the pyrometer, is smaller than the pyrometer spot size, or is in rapid motion.
With a green laser for real spot size indication at any distance, aligning the sensor becomes effortless, even on red glowing surfaces.
The electrically isolated sensing head enhances safety and reliability. It is completely passive and connected with fiber optics to the electronics box. With and ambient temperature limit of up to 315 °C without cooling, this pyrometer is well-suited for the most challenging applications.
Another attribute of such and infrared ratio thermometer is its precise non-contact temperature measurement facilitated by separate electronics. The interface includes easily accessible programming keys and and LCD. The stainless steel housing of the pyrometer enhances durability and is suitable for varied industrial settings. A ratio infrared sensor of the Optris CTratio emphasizes flexibility, with the electronics box providing a range of analog and digital outputs, including 0/4 – 20 mA, 0 – 5 V, 0 – 10 V, USB, RS485, RS232 interfaces, relay outputs (2 x optically isolated), Profibus DP, ProfiNet and Ethernet, Ethernet IP. The Optris CTratio also offers isolated analog outputs. The interface includes easily accessible programming keys and and LCD, simplifying the configuration process.
Its adaptability, durability, and accuracy make it a standout choice for industries where temperature control is critical. Designed and manufactured in Germany, the rugged design of the Optris CTratio makes it the perfect tool for industrial manufacturing applications within the metal and semiconductor industry.
CTratio are best suited for
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